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The sleep-deprived, often disorienting way a person feels after working on so many impending deadlines their life has become a blur, usually made possible by the regular consumption of several litres of caffeinated beverage in short amounts of time.
Huh? Oh, I get it now. Sorry: brain-lag!

Employer: "Have you been here all night? You look like shit!"
Employee: "Yeah, a bad case of brain-lag..."
{employer leaves cubicle}
Employee: "...bastard."
brain-lag by Adam Schilling July 16, 2008

Brainlapse 

This usually occurs early in the morning, and the period you can be affected by it will extend the less sleep you got the previous night. During a Brainlapse, you forget where you were going, what you were doing and sometimes who you are.

Brainlapsing is usually accompanied by a halt in movement until the Brainlapse has passed.
Person 1: Hey, Person 2.
Person 2: ...
Person 1: Hello?
Person 2: Wha-
Person 1: ...
Person 2: Oh, right. Sorry, I had a Brainlapse. I was up late last night.
Brainlapse by Jake Was Here December 26, 2007

Brainage 

(Bray-Nidge)

Meaning intelligence. Made popular by the comedy duo Lano & Woodley.
Lano- "...My wallet went down in the plane, jees, get a bit of brainage"
Brainage by Jaq_Shawty March 15, 2009

branlage 

Il est branlage.
He is fapping.
branlage by Ninja337 August 23, 2006

Brainfag 

A derivative of brain and fag, brainfag can be used to convey multiple meanings.

1) When your brain stops thinking.

2) When you come up with a brilliant idea to an extent that you think of making love to your own brain/own gender!

3) When your brain is on a roll and you are constantly emitting great ideas.
eg. of 1) “Dude, I am so brainfag-ed!”
eg. of 2) “Man, I am such a brainfag. Look at this piece I have just written!”
eg. of 3) “Look at me brainfag-ing!”
Brainfag by brainfag January 12, 2016

Brainage 

brain fluids inside of your brain
the brainage of Albert Einstein was blowing me away!
Brainage by IDKWOWAWESOME! July 22, 2015